I think both are 8ohm. Installed the latest AMD Omega video driver, makes a big difference in Kodi running DXVA2 HD. I am begining to love my 50" Hisense D-LED.
SD content still does not look quite as good as on plasma but getting there. I think with the right tweaks in the video driver settings it will be on par with my old 51" PDP.
Just from curiosity if you don't mind me asking, why would you change a 51" plasma for a 50" LED, unless the plasma broke. Never the less enjoy your new buy.